Each of her friends will receive 1/4 of the pie. There were four pieces of the pie, if there are three even pieces now and there are three friends. Each one will get 1 slice each.
5x + 6 + (-7x - 4)
5x + 6 - 7x - 4
-2x + 2
Pounds because I don't think that a sink weighs a ton and ounces would be far to complex. Plus, you are measuring the capacity of a sink...
Sorry if the answer sucks! I'm new at this and not all that smart...
First, let's find all the factors of 81:
81/3=27
27/3=9
9/3=3
3/1=1
So the factors of 81 are 3,3,3,3, (the numbers by which we divided here).
This means we can write down 81 as 3*3*3*3 or

- which is the answer to the question! (three to the power of 4)